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