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