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