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