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