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