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