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