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