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