One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,8)(5,14)(6,10)(9,15)(11,12)(13,16)(17,18)(19,25)(20,28)(21,24)(22,27)(23,29)(26,30)(31,32)(33,34)(35,41)(36,39)(37,44)(38,42)(40,46)(43,47)(45,48) involution — undirected(1,3)(2,7)(4,5)(6,11)(8,14)(9,16)(10,12)(13,15)(17,18)(19,25)(20,28)(21,24)(22,27)(23,29)(26,30)(31,32)(33,35,38,44)(34,37,42,41)(36,43,46,48)(39,45,40,47)(3,11)(4,13)(7,12)(8,16)(17,18,21,24)(19,22,27,25)(20,23,29,28)(26,30,32,31)(33,36,38,46)(34,39,42,40)(35,43,44,48)(37,45,41,47)(1,4,6,13)(2,8,10,16)(3,5,11,15)(7,14,12,9)(17,18)(19,25)(20,23)(21,24)(22,27)(26,31)(28,29)(30,32)(33,36)(34,40)(35,43)(37,47)(38,46)(39,42)(41,45)(44,48)(1,5)(2,9)(3,4)(6,15)(7,16)(8,12)(10,14)(11,13)(17,19)(18,22)(20,26)(21,27)(23,30)(24,25)(28,31)(29,32)(33,37,38,41)(34,35,42,44)(36,45,46,47)(39,43,40,48)(1,2)(3,12)(4,8)(5,9)(6,10)(7,11)(13,16)(14,15)(17,20,21,29)(18,23,24,28)(19,26,27,32)(22,30,25,31)(33,35)(34,41)(36,43)(37,42)(38,44)(39,47)(40,45)(46,48)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.