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