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