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