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