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