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