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