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