One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,13)(4,9)(5,10)(6,11)(7,12)(8,14)(15,16)(17,18)(19,24)(20,25)(21,31)(22,27)(23,28)(26,30)(29,32)(33,34,38,42)(35,39,37,41)(36,44,45,40)(43,48,46,47)(3,14)(4,15)(8,13)(9,16)(17,18)(19,29)(20,25)(21,26)(22,27)(23,28)(24,32)(30,31)(33,34)(35,39)(36,40)(37,41)(38,42)(43,47)(44,45)(46,48) involution — undirected(1,3)(2,8)(4,11)(5,15)(6,16)(7,14)(9,10)(12,13)(17,19,23,32)(18,24,28,29)(20,30,27,21)(22,31,25,26)(33,35,38,37)(34,39,42,41)(36,43,45,46)(40,47,44,48)(1,4,7,15)(2,9,12,16)(3,11,14,5)(6,8,10,13)(17,20)(18,25)(19,30)(21,32)(22,28)(23,27)(24,26)(29,31)(33,36)(34,40)(35,43)(37,46)(38,45)(39,47)(41,48)(42,44)(1,5,7,11)(2,10,12,6)(3,15,14,4)(8,9,13,16)(17,21,23,30)(18,26,28,31)(19,20,32,27)(22,29,25,24)(33,34)(35,39)(36,40)(37,41)(38,42)(43,47)(44,45)(46,48)(1,6,7,10)(2,11,12,5)(3,16,14,9)(4,13,15,8)(17,22,23,25)(18,27,28,20)(19,31,32,26)(21,29,30,24)(33,37,38,35)(34,41,42,39)(36,43,45,46)(40,47,44,48)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.