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