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