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)(11,15)(12,13)(14,16)(17,18,23,28)(19,29,32,41)(20,34,38,42)(21,27,22,26)(24,33,40,30)(25,35,44,37)(31,43,36,39)(45,47,48,46)(2,6)(7,8)(9,10)(11,14)(12,13)(15,16)(19,30)(20,35)(21,22)(24,29)(25,42)(26,27)(32,33)(34,44)(37,38)(40,41)(45,48)(46,47) involution — undirected(1,3,5,4)(2,7,6,8)(10,13)(14,15)(17,19,21,30,23,32,22,33)(18,24,26,29,28,40,27,41)(20,36,37,47,38,31,35,46)(25,43,34,48,44,39,42,45)(9,11,12,16)(10,14,13,15)(17,20,22,35,23,38,21,37)(18,25,27,42,28,44,26,34)(19,31,33,47,32,36,30,46)(24,39,41,48,40,43,29,45)(1,4,5,3)(2,7,6,8)(19,32)(24,40)(29,41)(30,33)(31,36)(39,43)(45,48)(46,47)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.