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