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