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