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