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