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