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