One vertex per element, one color per generator, with an edge from x to x·s.
(1,2) involution — undirected(3,4)(5,11)(6,9)(7,10)(8,13)(12,17)(14,16)(15,18)(19,20)(21,31)(22,30)(23,26)(24,37)(25,28)(27,34)(29,39)(32,47)(33,49)(35,42)(36,44)(38,46)(40,45)(41,48)(43,50) involution — undirected(3,5,7,13)(4,8,10,11)(6,14,15,12)(9,17,18,16)(20,26)(21,32)(28,30)(29,42)(33,40)(34,48)(37,44)(38,50)(3,6,7,15)(4,9,10,18)(5,12,13,14)(8,16,11,17)(19,21,23,32)(20,27,26,41)(22,33,25,40)(24,38,36,50)(28,43,30,46)(29,45,42,49)(31,44,47,37)(34,35,48,39)(4,10)(8,11)(9,18)(16,17)(19,22,23,25)(20,28,26,30)(21,33,32,40)(24,35,36,39)(27,43,41,46)(29,44,42,37)(31,45,47,49)(34,38,48,50)A 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.