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