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