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