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