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