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