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