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