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