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