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