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