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