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