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