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