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