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