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