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