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