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