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