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