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