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