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