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