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