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