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