One vertex per element, one color per generator, with an edge from x to x·s.
(2,3)(5,6)(7,8)(9,13)(10,14)(11,15)(12,19)(16,18)(17,20)(21,22,26,30)(23,27,32,36)(24,29,25,28)(31,34,33,35)(1,2)(3,4)(5,7)(6,8)(9,16)(10,12)(11,17)(13,18)(14,19)(15,20)(21,23)(22,27)(24,31)(25,33)(26,32)(28,35)(29,34)(30,36) involution — undirected(1,3,4,2)(5,8)(6,12)(7,13)(9,18)(10,19)(11,20)(14,17)(15,16)(22,28)(24,25)(27,34)(29,30)(31,33)(35,36)(5,9,11,10)(6,13,15,14)(7,16,17,12)(8,18,20,19)(21,24,26,25)(22,29,30,28)(23,31,32,33)(27,34,36,35)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.