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