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