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