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