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