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