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