One vertex per element, one color per generator, with an edge from x to x·s.
(2,6)(3,8)(9,10,13,12)(11,15,16,14)(17,18,22,24)(19,25,27,20)(21,29,30,23)(26,28,32,31)(1,2)(3,4)(5,6)(7,8)(9,11,13,16)(10,14,12,15)(1,3)(2,7)(4,6)(5,8)(17,19,22,27)(18,20,24,25)(21,26,30,32)(23,28,29,31)(1,2)(3,4)(5,6)(7,8)(17,20)(18,19)(21,28)(22,25)(23,26)(24,27)(29,32)(30,31) involution — undirected(1,2)(3,7)(4,8)(5,6)(9,12,13,10)(11,15,16,14)(17,21,22,30)(18,23,24,29)(19,26,27,32)(20,28,25,31)(1,4,5,7)(2,3,6,8)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.