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