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