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