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