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