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)(11,14)(12,13)(15,16)(18,23)(20,24)(26,31)(27,29)(1,3,5,4)(2,6,7,8)(10,13)(11,15)(17,18,21,23)(19,27,25,29)(20,28,24,32)(22,31,30,26)(2,7)(6,8)(9,11,12,15)(10,14,13,16)(17,19)(18,24)(20,23)(21,25)(22,32)(26,29)(27,31)(28,30)(10,13)(14,16)(18,23)(19,25)(26,31)(28,32) involution — undirected(1,4,5,3)(2,8,7,6)(17,20)(18,25)(19,23)(21,24)(22,27)(26,28)(29,30)(31,32)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.