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