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