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