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