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