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