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