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