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