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