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