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