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