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