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