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)(17,18,22,24)(19,21,26,23)(20,25,28,31)(27,29,32,30)(9,11,13,16)(10,14,12,15)(17,19,22,26)(18,23,24,21)(20,27,28,32)(25,30,31,29)(2,6)(3,8)(18,24)(19,26)(20,28)(29,30) involution — undirected(1,3,5,8)(2,7,6,4)(9,12,13,10)(11,15,16,14)(17,20)(18,25)(19,27)(21,29)(22,28)(23,30)(24,31)(26,32)(17,19)(18,21)(20,27)(22,26)(23,24)(25,29)(28,32)(30,31) involution — undirected(1,4,5,7)(2,8,6,3)(17,21)(18,19)(20,29)(22,23)(24,26)(25,27)(28,30)(31,32)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.