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