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