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