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